I'm fairly certain that I ovulate at a different time to what the app says, my periods are different every month, average cycle is usually 27 days, however I have had 1 month where I had a 34 day cycle, today will be day 30 of this cycle, still no period, took a cheap test yesterday and it was neg, Ive been feeling really tired and achy lately, I hate waiting, I'm going to wait untill Wednesday(day 34) to test agen, has anyone else had a negative this far out and then got a positive after?